2 years ago

2018 July August Marina World

  • Text
  • Marine
  • Marinas
  • Decking
  • Pontoons
  • Docks
  • Pontoon
  • Poralu
  • Berths
  • Products
  • Concrete
The magazine for the marina industry


PONTOON/DOCK SYSTEMS & DECKING require more pile and that’s expensive. When you consider all factors such as anchoring, utilities and installation your best option will rise to the top. Eric Noegel, manager of project development Bellingham Marine, describes launch docks for human-powered craft: Human-powered craft is a huge growing market. Access to the water should be easy and safe. Place the launch dock in an area with limited cross traffic but near convenient parking and storage. Docks should be stable and as low to the water as possible where the craft are launched. Concrete docks are a great choice for this application. Their tremendous live-load capacity and stability allows them to get low to the water without jeopardizing safety. Adding marine grade carpet or hardwood decking improves long-term wear and tear, prevents scuffing of boat bottoms and is friendlier to sit on. In a new marina you can build a launch dock into a walkway. For existing marinas adding a special-purpose launch dock is an easy option. The dock can be attached by a physical connection or tied off to several cleats. Jim Engen, manager of project development Bellingham Marine, talks about grating requirements and bans on treated wood: Our concrete and framed systems can incorporate grating to meet the 50% light penetration requirement. The unique paddle craft dock at Burton Chace Park, Marina del Rey, California fits perfectly into an open area on the existing dock and attaches via ropes and cleats. One option is to install concrete floats for main walks and narrow timberframed fingers that reduce over-water coverage and meet requirements. The fingers gain stability and longevity when connected to concrete main walks. Concrete docks with FRP walers and metal-frame systems satisfy bans on the use of treated wood. Randy Mason, principal engineer Anchor QEA, shares his experience on building marinas for mixeduse: Separate the marina into zones. Take into account access, water depth, fuelling, domestic waste handling, power, prevailing wind directions and waterside and landside approaches. Superyachts want exclusive real estate away from public docks and charter vessels. They also need delivery access. Public docks need adjacent vehicle parking. Charter vessels don’t usually care what is adjacent to them, but they are noisy. They require a staging area for arriving passengers and need a lot of parking. Keep them separated from other zones. The idea is to create an optimal user experience in each zone. Stay flexible. Even the most experienced designers find themselves with unintended consequences. Adopt operational plans that can be adjusted as tenants fill all the spaces. Eric Noegel, manager of project development Bellingham Marine, on grounding out: Docks that ground out are subject to unique forces that timber docks handle exceptionally well. They have a lower draft and the ability to bend and flex without fatigue. Metal-framed systems or concrete pontoons may be a viable option as well. Some owners have had great success with concrete floats at launch ramps. With legs, rubber buffers, or sleeper boards placed on the underside of the pontoon, the float grounds out without a problem. Craig Funston, vicepresident of engineering Bellingham Marine, on dealing with debris on rivers: There are many site-specific debrisdeflection options. First, study the flow of the river to determine how much and what type of debris the site will see. Concrete floating docks can be cast with tapered bottoms designed to pass debris under the float to prevent it from accumulating against the docks. Sacrificial timber panels can be attached to the dock. You can even go as far as to armour the floats with steel panels. Determine the risk debris or ice presents relative to the expense of armouring the floats. Concrete docks can be manufactured with thicker walls and increased reinforcing, but keep in mind there are limits imposed by flotation requirements of the overall system. Damage-tolerant panels that can be replaced at moderate expense may be a sensible option. Steve Ryder, manager of project development Bellingham Marine, tells us how to extend the height of existing pile. The most common solution for timber pile is replacement. However, some have had success extending the timber pile by sleeving it with PE pipe and plugging the top with concrete grouting. Concrete pile can be extended by attaching an additional concrete segment but this option is generally expensive. A cheaper option may be a steel addition. For steel pile the solution is more straightforward. New sections can simply be welded on to the existing pile. Adding height changes the lateral loading, so the pile may have to be driven further down to accommodate increased loads generated by taller pile. 42 - July/August 2018

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